Atlas Obscura readers nominated their favorite unlikely creatures.

For as many fascinating, downright unbelievable places as there are to explore on our planet, there are just as many, if not far more, mind-blowing animals. Sometimes it can feel like nature is taking its cues from a hyperactive 12-year-old with a big imagination, or that all the alien creatures we need already exist right here on Earth. A deer with long vampire fangs? Sure. A shrimp that punches so hard and fast that the water boils around it? Oh yes, that’s real. How about a pudgy little rodent-like creature with a mouth full of sharp teeth and elephants as its closest relative? Hello, rock hyrax. We recently asked Atlas Obscura readers in our Community forums to tell us about the most shocking and unbelievable animals they’d ever heard of, and the responses were both truly insane and delightfully based in reality.

Immortal Jellyfish

“This jellyfish doesn’t mean to brag, but it’s both beautiful and immortal. If it gets sick, or even stressed, it just reverts into it’s younger self so it can get strong and mature again, bouncing between youth and adulthood forever.” — tralfamadore

Aardwolf

Axolotls

“I find all species all fascinating, but to me the one that blows my mind has got to be the axolotl. This critter has a very special place in my heart as I worked in its conservation in Mexico. It is awesome for many reasons. It was worshipped as the manifestation of the Aztec god, Xolotl, it typically spends its whole life in a ‘forever young,’ larval tadpole form, it can regenerate its limbs and organs (heart, lungs, eyes, brain, etc.) if they get damaged, and it’s a model organism for studying treatment and cures for degenerative diseases like cancer, heart disease and injuries such as third degree burns.” — Monsieur_Mictlan

Ocean Sunfish

“Who can help but love the ocean sunfish (Mola mola and its relatives)?! It has no tail! (Though it looks like it’s nothing but head and tail, the ‘tail’ is fused dorsal and anal fins.) It has fewer vertebrae than any other vertebrate! It is the largest bony fish, at four meters or more! It’s related to the pufferfish but matures into this gigantic, weird, harmless beast!” — hhallenadams2

Blue Glaucus

Pangolins

Sea Sapphires

“OMG, the sea sapphire, hands down. It’s one of the most beautiful animals I’ve ever seen, plus it’s invisible like half the time. They’re a type of crustacean known as a copepod and run just a few millimeters long—squee! Thanks to layers of honeycombed crystal plates inside their cells, they can wink from iridescence to invisibility in a matter of seconds. Sea sapphires often cluster by the surface of the water, making the ocean appear studded with a galaxy of diamonds. Japanese fishermen called these convergences ‘tama-mizu,’ or jeweled water.” — sabrinaimbler

Secretary Birds

Horror Frogs

“I was deciding between thorny devils which shoot blood out of their eyes; gastric brooding frogs, which swallow their eggs and regurgitate them as babies; and the peacock mantis shrimp which can shatter fish tanks by clamping its inch long claws. But I feel like the hairy frog deserves some loving. The hairy frog gets its name from vascularized, hair-like appendages that sometimes grow on males. In addition to the horrifying appearance the ‘hair’ gives them, when threatened, they can break the bones in their fingers to push out as claws to defend themselves. Pretty metal.” — laurelkastner

Peacock Spiders

“PEACOCK SPIDERS ARE AWESOME. We had an Australian Museum travelling show at our local museum and although I knew about them, I utterly fell in love with them… I came up with a (sort of) simple puppet version for kids to make at an art station, scaled up by 10. Some of the most successful ones even used similar leg colourings as there are so many species. I still have one attached to the rearview mirror in the car and usually it just jiggles about provocatively but if you take a certain corner on the way home, at a certain time of the afternoon, it’s shadow runs sideways along the dashboard, which I find hilarious. The kids’ friends, not so much.” — Persey

Mantis Shrimp

“As soon as I read the title of this thread I thought of the mantis shrimp. Specifically that piece by The Oatmeal. That creature has so many superpowers, I can’t even get my head wrapped around it. One of which is seeing colors that we humans cannot even imagine that are in existence!” — kmarley38

Rock Hyrax

“How about some love for the rock hyrax? Beyond having an amazing name and brilliantly strange family tree, the rock hyrax looks like a cute and possibly cuddly groundhog. Though sometimes, when challenged for food or territory, he may show you a different side… The rock hyrax is native to Africa and the Middle East and amazingly enough, is most closely related to the elephant. Yes, you read that correctly, this little guy is related to elephants. Rock on rock hyrax!” — Megs0101

Aye-Ayes

Jerboas

“Jerboas are tiny little kangaroo-bunny-mice that use their little pom-pommed tail for balance while they bounce around deserts at speeds of 15 mph. They live in burrows, often have four homes (fancy!) and clean themselves by having dust baths. There are different kinds, but they all absolutely look like a creature I would have made up as a child. Can you get any cuter than this?” — rozanna

Gooseneck Barnacles

“When first I saw these strange creatures writhing on a large piece of driftwood cast upon a desolate beach, I wondered if it were an alien encounter. I survived, and only recently discovered that they’re crustaceans.” — rossau

Platypus

“What, no love for the platypus? Proof that God gets high on occasion? Seriously. It lays eggs. It produces milk for its young. It has a bill loaded with sensors that can pick up a worm’s electrical field under the mud. It has webbed feet and a beaver-like tail. The males have venomous spurs on their rear ankles!” — La_Belle_Gigi

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